diff --git a/graphics/grClip.c b/graphics/grClip.c
index 7631ba75..d90b5500 100644
--- a/graphics/grClip.c
+++ b/graphics/grClip.c
@@ -434,7 +434,7 @@ GrClipLine(x1, y1, x2, y2)
 	    {
 		Point p1, p2;
 		Rect c;
-		bool ok1, ok2;
+		bool ok1 = FALSE, ok2 = FALSE;
 		c = ob->r_r;
 		c.r_xbot--;  c.r_ybot--;
 		c.r_xtop++;  c.r_ytop++;